Die-box for stamping-machines



(No Model.)

L. H. TBUAX.

Die BOX for Stamping Machines.

- No. 232,912. Patented Oct. 5,1880.

Uwrrao STATES PATENT @rrrea.

LEONARD H. TRUAX, OF ST. JOHNSBURY, VERMONT.

DIE-BOX FOR STAMPING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 232,912, dated October5, 1880,

Application filed June 30, 1880. (No model.)

To all whom it may concern:

Beit known that I, LEONARD H. TRUAX, of St. Johnsbury, in the county ofCaledonia and State of Vermont, have made certain Improvements inDie-Boxes for Marking Scale-Beams, of which the following is aspecification.

My invention relates to improvements in die-boxes for markingscale-beams metallic squares, and other articles of like character.

The object of my invention is to provide a device which will, byallowing an automatic adjustment of the dies, operate in a uniformmanner and overcome the variations in the surface and thickness of thearticle on which the impression of the dies is made.

My invention consists in the peculiar construction of the die-box and ofthe means employed for permitting an automatic adj ustment of the diesin combination therewith, all of which will be more fully hereinafterexplained, and specifically set forth in the claims.

In order to enable others skilled in the art to which my in entionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, whichform part of this specification, and in which' Figure 1 is a sideelevation of my die-box. Fig. 2 is a longitudinal section of the same,showing the dies in position. Fig. 3 is a crosssection of the same. Fig.4 is a plan View of one of the dies.

A represents a metallic box, having movable ends a properly secured.

At the base of the slot within which the dies 0 are placed is a chamberof greater width than the said slot, formed by two squarely-cut grooves,b b, Fig. 3. Within this chamber is fitted neatly a strip of rubber, c,of suitable quality. Above the rubber, and extending beneath theshoulders formed by said grooves b 2), near the base of the slot, isdriven a piece of flexible steel, d, neatly fitted therein, whichslightly compresses the rubber strip 0. By this means the rubber isconfined so that it cannot expand in any manner, save as describedhereinafter, thus securing a positive and strong resistance to pressure.a

On the steel plate (I the dies 6 and blanks or guards 0 rest and areheld in position within the box A by the set-screwy.

Through the side of the box A, on line with the edge of the rubber strip0, are orifices, within which are fitted closely pins or rods g, Fig. 3,that serve as valves, for the purpose hereinafter stated. These rods 9are held in place, firmly pressed upon the edge of the rubber c, bystrong springs h, the upper ends of which are secured to the side of thebox A by screws or otherwise, Figs. 1 and 3.

My invention is more especially designed for use in machines for markingscale-beams, 850., when both sides or one side of the beam is to bemarked with a single impression, similar to that for which LettersPatent were is sued to me February 3, 1880, No. 224,116, and itsoperation is as follows:

The dies 6 and blanks 0 being suitably arranged within the box A, theirbases resting upon the flexible steel plate (I, and made sufficientlysecure therein by the set-sorewf, the dies are brought to bear upon thework.

As this work may not always be of uniform surface or thickness, thepressure at those points of variation will be sufficient to compress therubber beneath the dies and allow them to fall back.

The rubber is permitted to yield through the medium of the vents formedby the openings in the side of the box, pressing out the rods'g, thusallowing an automatic adjustment of the dies.

The dies are prevented from sinking too far into or impressing thesurface of the work too deeply by the blanks c, which, in combinationwith the automatic adjustment of the dies, cause an equality of depth tobe given the impression made upon the surface marked.

After the pressure is removed from the dies the rods are forced backupon the rubber by the springs h, which also exert a strong re sistanceto the expansion of the rubber through the openings, as stated.

Any requisite number of vents can be arranged in the side of the boxthat may be required for the purpose described.

Having thus described my invention, what I Wish it to be understoodtha-tIclaim asnew, and desire to secure by Letters Patent, is-

1. The combination ot'dies c, blanks 0, yielding strip 0, elastic platecl, and boX A, substantially as shown and described.

2. The combination of a die-box having a yielding seat for the dies,composed of a flexible strip, \vhereon the dies rest, and an elasticsubstance beneath, and the means employed for allowing an expansion ofthe said yielding substance, consisting" of the rods or pins 9 andspring-levers 71 substantially as shown and described, and for thepurpose stated.

LEONARD H. TRUAX.

Witnesses:

OLIVER 1. BROWN, CHARLES CARPENTER.

